diff --git a/functions.js b/functions.js
index 35cd411..eb9ddb4 100644
--- a/functions.js
+++ b/functions.js
@@ -15,5 +15,5 @@ function mapResponse(array = []) {
 }
 
 module.exports = {
-  mapResponse
+  mapResponse,
 };
diff --git a/index.js b/index.js
index e5ff813..f4fe45d 100644
--- a/index.js
+++ b/index.js
@@ -38,12 +38,12 @@ function checkParams(input, period, interval, pointscount) {
  * @return {Promise<Array>} An array of arrays with date (timestamp) and values (number) properties
  */
 async function callInvesting(pairId, period, interval, pointscount) {
-  const url = `https://api.investing.com/api/financialdata/${pairId}/historical/chart?period=${period}&interval=${interval}&pointscount=${pointscount}`
+  const url = `https://api.investing.com/api/financialdata/${pairId}/historical/chart?period=${period}&interval=${interval}&pointscount=${pointscount}`;
 
   const response = await fetch(url, {
     headers: new Headers({
-      "upgrade-insecure-requests": "1"
-    })
+      'upgrade-insecure-requests': '1',
+    }),
   });
 
   if (!response.ok) {
@@ -51,7 +51,7 @@ async function callInvesting(pairId, period, interval, pointscount) {
   }
 
   const json = await response.json();
-  return json.data
+  return json.data;
 }
 
 /**
diff --git a/test/test.js b/test/test.js
index 0946c55..e7b2180 100644
--- a/test/test.js
+++ b/test/test.js
@@ -11,7 +11,6 @@ const mockData = [
 ];
 
 describe('Tests for Investing.com unofficial APIs', () => {
-
   it('should map an array of arrays to array of objects', () => {
     const mappedResponse = mapResponse(mockData);
     assert.strictEqual(mockData[0][0], mappedResponse[0].date);
@@ -45,5 +44,4 @@ describe('Tests for Investing.com unofficial APIs', () => {
     const response = await investing('currencies/eur-usd', 'P1M', 'P1D', 20);
     assert.strictEqual(response, undefined);
   });
-
 });